Question

$(a + b)(a - b) \\ - - - - - - - \\ a - 2ab + {b}^{2} \: \: \: \: (a = 1) \: \: (b = 2)$
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Answer 1

Respuesta:

-3

Explicación paso a paso:

(1+2)(1-2)/1-2.1.2+4

=)(3)(-1)/1

=-3